[Orangi pi zero uart error with ARMBIAN 5.38 and 5.32]

Hi.

I want to use uart on 500000 baudrate.

Before i had used it with ARMBIAN 5.32.

But i had some problems about board temperature.

So, i updated it  brand-new image. it was 5.38. 

and then some packet are crashing or missing frequently. 

 

I used same program for this test.

I only counted received packets.

It works fine with ARMBIAN 5.32 user-built Ubuntu 16.04.2 LTS 4.11.7-sun8i

Received packets are 4500000.

But, it doesn't with ARMBIAN 5.38 stable Ubuntu 16.04.4 LTS 4.14.18-sunxi

Received packets are 4504376.

 

I also checked configuration using "setserial".

 

the differece was only irq number.

 

please i need your help.

what should i check? 

 

 

 

 

 

[Orange pi zero Mainline kernel, SPI Clk is weird.]

Hi.

Kernel version : 4.11.7-sun8i

 

My trouble is that clk is weird in using spidev. 

This is a oscilograph when i send a command with spi.

First line is CLK and second line is CS0.

 

 

My slave chip can not receive commands.

and I think it due to this weird CLK. 

CS seems affect CLK.

 

I just want to use spi with CS keeping active-low.

But, following code setting mode of spi occured an error.  "invalid argument exception"  

	mode = SPI_MODE_1 | SPI_NO_CS; 
	if (ioctl(file,SPI_IOC_WR_MODE32,&mode)<0){
		perror("can't set spi mode");
		return;
	}

this work properly.

	mode = SPI_MODE_1; 
	if (ioctl(file,SPI_IOC_WR_MODE32,&mode)<0){
		perror("can't set spi mode");
		return;
	}

so i used this code setting spi_ioc_transfer.

	xfer[0].cs_change = 0; /* Keep CS activated */
	xfer[0].delay_usecs = 0, //delay in us
	xfer[0].speed_hz = 12000000, //speed
	xfer[0].bits_per_word = 8, // bites per word 8

but cs still work and affect clk. 

 

this is my /boot/armbianEnv.txt

verbosity=1
logo=disabled
console=both
disp_mode=1920x1080p60
overlay_prefix=sun8i-h3
rootdev=UUID=4d25b54f-cc4d-4215-93e3-b5e3868e5a06
rootfstype=ext4
overlays=uart1 uart2 spi-spidev
param_spidev_spi_bus=1
param_spidev_spi_cs=1

Thank you.